What the ratings mean for fit
The 3VA1332-6GF42-0AA0-ZD00 is a Siemens 3VA1 IEC frame 400 molded case circuit breaker with a 70 kA Icu at 415 V — that's breaking capacity class H, meaning it safely interrupts faults up to 70 kA without upstream fuses or a larger frame. The 4-pole construction with 100% N conductor protection suits it for three-phase plus neutral systems where the neutral carries full phase current, common in DC power OEM builds in China. Overload protection is set via the TM240 thermal-magnetic trip unit, adjustable from 224 A to 320 A (Ir). Short-circuit protection (Ii) is fixed at 5 to 10 times In.
Integration notes
The 3VA1 frame mounts on a standard DIN rail or panel base. At 320 A, the breaker requires adequate clearance for heat dissipation.